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Decouple icons pixel data from WebApplicationInfo metadata.

The Update and Sync-Initiated installs will use it to override icon pixel
data. See next CL:
https://chromium-review.googlesource.com/c/chromium/src/+/1858025

Bug: 860583
Change-Id: Ief987de76bfd1389835c1318e57fb7d79ac4728d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861443
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706698}